They seem to perform just as well as Brother factory cartridges in terms of print quality and clarity, but at a much lower price. On rare occasions, we end up with a page with a barely visible leading-edge error that never affected the document's legibility. No issues for my personal use, but something to watch out for when printing materials for handouts or presentations. I can't yet say how long they will last, but it has printed more than the starter cartridge that came with the printer.
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